--- /dev/null
+{-# OPTIONS -fno-implicit-prelude #-}
+
+module Test18 where
+
+import PrelGHC
+import PrelBase
+
+eftCharFB c n x y = go x
+ where
+ go x | x ># y = n
+ | otherwise = C# (chr# x) `c` go (x +# 1#)
+
+
+eftIntFB c n x y | x ># y = n
+ | otherwise = go x
+ where
+ go x = I# x `c` if x ==# y then n else go (x +# 1#)
+
+eftIntList x y | x ># y = []
+ | otherwise = go x
+ where
+ go x = I# x : if x ==# y then [] else go (x +# 1#)
+
+
+efdCharFB c n x1 x2
+ | delta >=# 0# = go_up_char_fb c n x1 delta 255#
+ | otherwise = go_dn_char_fb c n x1 delta 0#
+ where
+ delta = x2 -# x1
+
+efdCharList x1 x2
+ | delta >=# 0# = go_up_char_list x1 delta 255#
+ | otherwise = go_dn_char_list x1 delta 0#
+ where
+ delta = x2 -# x1
+
+efdtCharFB c n x1 x2 lim
+ | delta >=# 0# = go_up_char_fb c n x1 delta lim
+ | otherwise = go_dn_char_fb c n x1 delta lim
+ where
+ delta = x2 -# x1
+
+efdtCharList x1 x2 lim
+ | delta >=# 0# = go_up_char_list x1 delta lim
+ | otherwise = go_dn_char_list x1 delta lim
+ where
+ delta = x2 -# x1
+
+go_up_char_fb c n x delta lim
+ = go_up x
+ where
+ go_up x | x ># lim = n
+ | otherwise = C# (chr# x) `c` go_up (x +# delta)
+
+go_dn_char_fb c n x delta lim
+ = go_dn x
+ where
+ go_dn x | x <# lim = n
+ | otherwise = C# (chr# x) `c` go_dn (x +# delta)
+
+go_up_char_list x delta lim
+ = go_up x
+ where
+ go_up x | x ># lim = []
+ | otherwise = C# (chr# x) : go_up (x +# delta)
+
+
+go_dn_char_list x delta lim
+ = go_dn x
+ where
+ go_dn x | x <# lim = []
+ | otherwise = C# (chr# x) : go_dn (x +# delta)
+
+efdtIntFB c n x1 x2 y
+ | delta >=# 0# = if x1 ># y then n else go_up_int_fb c n x1 delta lim
+ | otherwise = if x1 <# y then n else go_dn_int_fb c n x1 delta lim
+ where
+ delta = x2 -# x1
+ lim = y -# delta
+
+efdtIntList x1 x2 y
+ | delta >=# 0# = if x1 ># y then [] else go_up_int_list x1 delta lim
+ | otherwise = if x1 <# y then [] else go_dn_int_list x1 delta lim
+ where
+ delta = x2 -# x1
+ lim = y -# delta
+
+efdIntFB c n x1 x2
+ | delta >=# 0# = go_up_int_fb c n x1 delta ( 2147483647# -# delta)
+ | otherwise = go_dn_int_fb c n x1 delta ((-2147483648#) -# delta)
+ where
+ delta = x2 -# x1
+
+efdIntList x1 x2
+ | delta >=# 0# = go_up_int_list x1 delta ( 2147483647# -# delta)
+ | otherwise = go_dn_int_list x1 delta ((-2147483648#) -# delta)
+ where
+ delta = x2 -# x1
+
+-- In all of these, the (x +# delta) is guaranteed not to overflow
+
+go_up_int_fb c n x delta lim
+ = go_up x
+ where
+ go_up x | x ># lim = I# x `c` n
+ | otherwise = I# x `c` go_up (x +# delta)
+
+go_dn_int_fb c n x delta lim
+ = go_dn x
+ where
+ go_dn x | x <# lim = I# x `c` n
+ | otherwise = I# x `c` go_dn (x +# delta)
+
+go_up_int_list x delta lim
+ = go_up x
+ where
+ go_up x | x ># lim = [I# x]
+ | otherwise = I# x : go_up (x +# delta)
+
+go_dn_int_list x delta lim
+ = go_dn x
+ where
+ go_dn x | x <# lim = [I# x]
+ | otherwise = I# x : go_dn (x +# delta)
+eftInt = eftIntList
+efdInt = efdIntList
+efdtInt = efdtIntList
+
+